I am writing an SPI DMA driver for the LPC55 as the NXP driver library doesn't quite do what I want. Is there a specification document available anywhere for the memory mapping of the SPI and DMA peripherals? I've pulled the structures out of the NXP drivers but I would like some more certainty that everything is as it should be, and to know whether the __I (input) __O (output) fields can be read from.
